- Synthesis, structural characterization, and thermoresponsivity of hybrid supramolecular dendrimers bearing a polyoxometalate core
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A series of cationic dendrons bearing triethylene glycol monomethyl ether terminal groups of different generations have been synthesized and used to encapsulate an inorganic polyanionic cluster [K12.5Na 1.5(NaP5W30O110)] through electrostatic interactions. The resulting dendritic cation-encapsulated polyoxometalate (POM) complexes, cluster-dendrimers, are soluble in water and exhibit lower critical solution temperatures (LCST). The thermoresponsivities of these complexes in aqueous solutions were studied by turbidimetry and variable-temperature 1H NMR spectroscopy. The observed cloud points show a remarkable dependence on the generation of the dendrons. Complexes composed of first-generation dendrons exhibit no obvious thermoresponsive properties, but for complexes bearing second-generation dendrons, the LCST decreases as the number of dendritic cations around the POM cluster increases. Complexes composed of third-generation cations underwent reversible aggregation and disaggregation upon heating and cooling, respectively. This thermally induced self-aggregation was characterized by DLS and TEM. In addition, the effects of salt and solvent on the LCST were investigated. This research demonstrates a new type of thermoresponsive dendritic organic-inorganic hybrid complex and provides a general route to the endowment of POMs with temperature-sensitive properties through electrostatic interactions.
- Chen, Hailong,Yang, Yang,Wang, Yizhan,Wu, Lixin
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supporting information
p. 11051 - 11061
(2013/09/02)
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- Phthalocyanine-centred and naphthalocyanine-centred aryl ether dendrimers with oligo(ethyleneoxy) surface groups
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The synthesis of the 1st, 2nd and 3rd generation phthalocyanine-centred and naphthalocyanine-centred poly(aryl ether) dendrimers possessing oligo(ethyleneoxy) surface groups is described. These materials are soluble in polar protic solvents. For both type
- Brewis, Matthew,Helliwell, Madeleine,McKeown, Neil B.
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p. 3863 - 3872
(2007/10/03)
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- Synthesis and characterisation of water-soluble poly(aryl ether) dendrimers for encapsulation of biomimetic active site analogues
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Synthetic strategies to incorporate active site analogues of metalloenzymes at the core of water-soluble dendritic structures are explored. Synthesis of water-soluble aryl ether dendrimers containing tripyridyl metal-binding sites is successful when a con
- Hannon, Michael J.,Mayers, Paul C.,Taylor, Paul C.
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p. 1881 - 1889
(2007/10/03)
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- Fullerodendrimers with peripheral triethyleneglycol chains
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Triethylene glycol terminated poly(aryl ether) dendritic branches with an aldehyde function at the focal point have been prepared and attached to C60 by a 1,3-dipolar cycloaddition. (C) 2000 Elsevier Science Ltd.
- Rio, Yannick,Nicoud, Jean-Fran?ois,Rehspringer, Jean-Luc,Nierengarten, Jean-Fran?ois
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p. 10207 - 10210
(2007/10/03)
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